add notification apis (#2066)

add alerting apis

add generic proxy

pkg/apiserver/apiserver.go

@@ -30,6 +30,7 @@ import (
 	"kubesphere.io/kubesphere/pkg/apiserver/filters"
 	"kubesphere.io/kubesphere/pkg/apiserver/request"
 	"kubesphere.io/kubesphere/pkg/informers"
+	alertingv1 "kubesphere.io/kubesphere/pkg/kapis/alerting/v1"
 	clusterkapisv1alpha1 "kubesphere.io/kubesphere/pkg/kapis/cluster/v1alpha1"
 	configv1alpha2 "kubesphere.io/kubesphere/pkg/kapis/config/v1alpha2"
 	devopsv1alpha2 "kubesphere.io/kubesphere/pkg/kapis/devops/v1alpha2"
@@ -37,6 +38,7 @@ import (
 	loggingv1alpha2 "kubesphere.io/kubesphere/pkg/kapis/logging/v1alpha2"
 	monitoringv1alpha3 "kubesphere.io/kubesphere/pkg/kapis/monitoring/v1alpha3"
 	networkv1alpha2 "kubesphere.io/kubesphere/pkg/kapis/network/v1alpha2"
+	notificationv1 "kubesphere.io/kubesphere/pkg/kapis/notification/v1"
 	"kubesphere.io/kubesphere/pkg/kapis/oauth"
 	openpitrixv1 "kubesphere.io/kubesphere/pkg/kapis/openpitrix/v1"
 	operationsv1alpha2 "kubesphere.io/kubesphere/pkg/kapis/operations/v1alpha2"
@@ -174,6 +176,8 @@ func (s *APIServer) installKubeSphereAPIs() {
 		s.SonarClient,
 		s.KubernetesClient.KubeSphere(),
 		s.S3Client))
+	urlruntime.Must(notificationv1.AddToContainer(s.container, s.Config.NotificationOptions.Endpoint))
+	urlruntime.Must(alertingv1.AddToContainer(s.container, s.Config.AlertingOptions.Endpoint))
 }
 
 func (s *APIServer) Run(stopCh <-chan struct{}) (err error) {

pkg/apiserver/config/config_test.go

@@ -95,7 +95,7 @@ func newTestConfig() (*Config, error) {
 			Version:     "6",
 		},
 		AlertingOptions: &alerting.Options{
-			Endpoint: "http://alerting.kubesphere-alerting-system.svc:9200",
+			Endpoint: "http://alerting-client-server.kubesphere-alerting-system.svc:9200/api",
 		},
 		NotificationOptions: &notification.Options{
 			Endpoint: "http://notification.kubesphere-alerting-system.svc:9200",

pkg/kapis/alerting/v1/register.go

@@ -0,0 +1,18 @@
+package v1
+
+import (
+	"github.com/emicklei/go-restful"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"kubesphere.io/kubesphere/pkg/kapis/generic"
+)
+
+var GroupVersion = schema.GroupVersion{Group: "alerting.kubesphere.io", Version: "v1"}
+
+func AddToContainer(container *restful.Container, endpoint string) error {
+	proxy, err := generic.NewGenericProxy(endpoint, GroupVersion.Group, GroupVersion.Version)
+	if err != nil {
+		return nil
+	}
+
+	return proxy.AddToContainer(container)
+}

pkg/kapis/generic/generic.go

@@ -0,0 +1,96 @@
+package generic
+
+import (
+	"fmt"
+	"github.com/emicklei/go-restful"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apimachinery/pkg/util/proxy"
+	"k8s.io/klog"
+	"kubesphere.io/kubesphere/pkg/api"
+	"kubesphere.io/kubesphere/pkg/apiserver/runtime"
+	"net/http"
+	"net/url"
+	"strings"
+)
+
+// genericProxy is a simple proxy for external service.
+type genericProxy struct {
+	// proxy service endpoint
+	Endpoint *url.URL
+
+	// api group name exposed to clients
+	GroupName string
+
+	// api version
+	Version string
+}
+
+func NewGenericProxy(endpoint string, groupName string, version string) (*genericProxy, error) {
+	parse, err := url.Parse(endpoint)
+	if err != nil {
+		return nil, err
+	}
+
+	// trim path suffix slash
+	parse.Path = strings.Trim(parse.Path, "/")
+
+	return &genericProxy{
+		Endpoint:  parse,
+		GroupName: groupName,
+		Version:   version,
+	}, nil
+}
+
+func (g *genericProxy) AddToContainer(container *restful.Container) error {
+	webservice := runtime.NewWebService(schema.GroupVersion{
+		Group:   g.GroupName,
+		Version: g.Version,
+	})
+
+	webservice.Route(webservice.GET("/{path:*}").
+		To(g.handler).
+		Returns(http.StatusOK, api.StatusOK, nil))
+
+	webservice.Route(webservice.PUT("/{path:*}").
+		To(g.handler).
+		Returns(http.StatusOK, api.StatusOK, nil))
+
+	webservice.Route(webservice.POST("/{path:*}").
+		To(g.handler).
+		Returns(http.StatusOK, api.StatusOK, nil))
+
+	webservice.Route(webservice.DELETE("/{path:*}").
+		To(g.handler).
+		Returns(http.StatusOK, api.StatusOK, nil))
+
+	container.Add(webservice)
+	return nil
+
+}
+
+func (g *genericProxy) handler(request *restful.Request, response *restful.Response) {
+	u := g.makeURL(request)
+
+	httpProxy := proxy.NewUpgradeAwareHandler(u, http.DefaultTransport, false, false, &errorResponder{})
+	httpProxy.ServeHTTP(response, request.Request)
+}
+
+func (g *genericProxy) makeURL(request *restful.Request) *url.URL {
+	u := *(request.Request.URL)
+	u.Host = g.Endpoint.Host
+	u.Scheme = g.Endpoint.Scheme
+	u.Path = strings.Replace(request.Request.URL.Path, fmt.Sprintf("/kapis/%s", g.GroupName), "", 1)
+
+	// prepend path from endpoint
+	if len(g.Endpoint.Path) != 0 {
+		u.Path = fmt.Sprintf("/%s%s", g.Endpoint.Path, u.Path)
+	}
+
+	return &u
+}
+
+type errorResponder struct{}
+
+func (e *errorResponder) Error(w http.ResponseWriter, req *http.Request, err error) {
+	klog.Error(err)
+}

pkg/kapis/generic/generic_test.go

@@ -0,0 +1,60 @@
+package generic
+
+import (
+	"github.com/emicklei/go-restful"
+	"github.com/google/go-cmp/cmp"
+	"net/http/httptest"
+	"net/url"
+	"testing"
+)
+
+var group = "test.kubesphere.io"
+var version = "v1"
+var scheme = "http"
+
+func TestNewGenericProxy(t *testing.T) {
+	var testCases = []struct {
+		description string
+		endpoint    string
+		query       string
+		expected    *url.URL
+	}{
+		{
+			description: "Endpoint with path",
+			endpoint:    "http://awesome.kubesphere-system.svc:8080/api",
+			query:       "/kapis/test.kubesphere.io/v1/foo/bar?id=1&time=whatever",
+			expected: &url.URL{
+				Scheme:   scheme,
+				Host:     "awesome.kubesphere-system.svc:8080",
+				Path:     "/api/v1/foo/bar",
+				RawQuery: "id=1&time=whatever",
+			},
+		},
+		{
+			description: "Endpoint without path",
+			endpoint:    "http://awesome.kubesphere-system.svc:8080",
+			query:       "/kapis/test.kubesphere.io/v1/foo/bar?id=1&time=whatever",
+			expected: &url.URL{
+				Scheme:   scheme,
+				Host:     "awesome.kubesphere-system.svc:8080",
+				Path:     "/v1/foo/bar",
+				RawQuery: "id=1&time=whatever",
+			},
+		},
+	}
+
+	for _, testCase := range testCases {
+		proxy, err := NewGenericProxy(testCase.endpoint, group, version)
+		if err != nil {
+			t.Error(err)
+		}
+
+		t.Run(testCase.description, func(t *testing.T) {
+			request := httptest.NewRequest("GET", testCase.query, nil)
+			u := proxy.makeURL(restful.NewRequest(request))
+			if diff := cmp.Diff(u, testCase.expected); len(diff) != 0 {
+				t.Errorf("%T differ (-got, +want): %s", testCase.expected, diff)
+			}
+		})
+	}
+}

pkg/kapis/notification/v1/register.go

@@ -0,0 +1,19 @@
+package v1
+
+import (
+	"github.com/emicklei/go-restful"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"kubesphere.io/kubesphere/pkg/kapis/generic"
+)
+
+var GroupVersion = schema.GroupVersion{Group: "notification.kubesphere.io", Version: "v1"}
+
+func AddToContainer(container *restful.Container, endpoint string) error {
+
+	proxy, err := generic.NewGenericProxy(endpoint, GroupVersion.Group, GroupVersion.Version)
+	if err != nil {
+		return err
+	}
+
+	return proxy.AddToContainer(container)
+}